Joshua will now try and reclaim his IBF, WBO and IBO heavyweight titles in Saudi Arabia however it's feared a few of the occasion could possibly be known as off.
While Joshua tipped the scales at 16 stone 13lbs - 10 pounds lighter than for their first fight in June - Ruiz has piled on more than a stone to tip the scales at 20 stone 3lbs.
AJ picked up a cut above his eye from a clash of heads in the second round, but continued to land big shots on a heavier and slower Ruiz Jr. That Ruiz has come in even heavier five months later was surprising.
Meanwhile Joshua's weight loss appeared to vindicate suggestions that he will aim to make himself more elusive, avoiding Ruiz's unsafe swings and dragging him into the later rounds where stamina will play a major part.
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Joshua started the fight strong, opening a cut above Ruiz' eye in the opening round with a stiff jab.
Joshua landed a strong left hook in the sixth but Ruiz Jr would not be dissuaded from plodding forwards and threatening his own punches.
When asked if Ruiz Jr would face off against Wilder, promoter Warren told Metro.co.uk: 'Ruiz won't be fighting Wilder in the next two fights and probably not in 2020.
Mexico's first ever heavyweight champion, by the seventh, was getting frustrated and the referee admonished him for more illegal shots.
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"We've listened to the critics and we are looking to potentially putting a woman on the undercard", Anthony Joshua nodded profusely. There was a collective intake of breath at ringside but Joshua did not go down.
Saturday's heavyweight title fight is about as momentous a title bout as the division has seen in several years.
The Watford man was given a 118-110, 118-110 and 119-109 victory by the judges as be avenged the only defeat of his career.
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Mais ne comptez pas sur le Portugais pour en faire une romance ou pour étaler sa soif de 'revanche'. Pour leurs retrouvailles, les Red Devils avaient envie de lui montrer ce dont ils étaient capables.